<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <!-- 引入vue3 js库 -->
    <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
</head>
<body>
    <!-- vue挂在容器 可以认为是vue根组件 -->
    <div id="app">
        <p>{{msg}}</p>
    </div>
    <script>
        //创建vue实例
        Vue.createApp({
           data(){
            return {
                msg:'Hello World'
            }
           }
        }).mount("#app")
    </script>
</body>
</html>